/**
 * Created with IntelliJ IDEA.
 * Description:
 */

/**
 *
Definition for singly-linked list.
*/
 public class ListNode {
     int val;
     ListNode next;
     ListNode() {}
     ListNode(int  val) { this.val = val; }
     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
}

class Solution {
    public ListNode reverseList(ListNode head) {
        if(head == null){
            return null;
        }
        ListNode prev = null;
        ListNode cur = head.next;
        ListNode curNext = head.next;

        while(cur != null){
            curNext = cur.next;
            cur.next = prev;
            prev = cur;
            cur = curNext;
        }
        return prev;
    }
}
